Stockholders' Equity - Schedule of Warrants Outstanding (Details) - Warrants to Purchase Common Stock - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Number of Shares
Outstanding at beginning of period (in shares)	353,610
Exercised (in shares)	0
Outstanding at end of period (in shares)	353,610	353,610
Exercisable (in shares)	353,610
Weighted- average Exercise Price
Outstanding at beginning of period (in dollars per share)	$ 9.78
Exercised (in dollars per share)	0.00
Outstanding at end of period (in dollars per share)	9.78	$ 9.78
Exercisable (in dollars per share)	$ 9.78
Weighted- average Remaining Contractual Term (years)
Outstanding	3 years 10 months 6 days	3 years 10 months 6 days
Exercisable	3 years 10 months 6 days
Aggregate Intrinsic Value
Outstanding	$ 1,863,331	$ 1,863,331
Exercisable	$ 1,863,331